TOI-858 B b: A hot Jupiter on a polar orbit in a loose binary

Hagelberg, J.; Nielsen, L.D.; Attia, O.; Bourrier, V.; Pearce, L.; Venturini, J.; Winn, J.N.; Bouchy, F.; Bouma, L.G.; Briceño, C.; Collins, K.A.; Davis, A.B.; Eastman, J.D.; Evans, P.; Falk, B.; Grieves, N.; Guerrero, N.M.; Hellier, C.; Jones, M.I.; Latham, D.W.; Law, N.; Mann, A.W.; Marmier, M.; Ottoni, G.; Radford, D.J.; Restori, N.; Rudat, A.; Dos, Santos, L.; Seager, S.; Stassun, K.; Stockdale, C.; Udry, S.; Wang, S.; Ziegler, C.

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EDP Sciences

Citation

A&A, 679, A70 (2023)

Journal

Astronomy and Astrophysics

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This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.

Abstract

We report the discovery of a hot Jupiter on a 3.28-day orbit around a 1.08 Ma G0 star that is the secondary component in a loose binary system. Based on follow-up radial velocity observations of TOI-858 B with CORALIE on the Swiss 1.2 m telescope and CHIRON on the 1.5 m telescope at the Cerro Tololo Inter-American Observatory (CTIO), we measured the planet mass to be 1.10a0.07+0.08 MJ. Two transits were further observed with CORALIE to determine the alignment of TOI-858 B b with respect to its host star. Analysis of the Rossiter-McLaughlin signal from the planet shows that the sky-projected obliquity is λ = 99.3a3.7+3.8 . Numerical simulations show that the neighbour star TOI-858 A is too distant to have trapped the planet in a Kozai- Lidov resonance, suggesting a different dynamical evolution or a primordial origin to explain this misalignment. The 1.15 Ma primary F9 star of the system (TYC 8501-01597-1, at ρ ~11) was also observed with CORALIE in order to provide upper limits for the presence of aplanetary companion orbiting that star. © 2023 EDP Sciences. All rights reserved.

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Open access journal

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0004-6361

DOI

10.1051/0004-6361/202244940

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Final Published Version

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UA Faculty Publications

© The Authors 2023. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License.

Except where otherwise noted, this item's license is described as © The Authors 2023. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License.